 (defprotocol IGraphExecutor
   (execute! [_])
   (stop! [_])
-  (notify! [_ evt])
+  (notify! [_])
   (include-vertex! [_ v]))
 
 (defn collect-pure

            (-deref [_] ctx)])
      IGraphExecutor
      (stop! [_] (err/unsupported!))
      (notify! [_ evt] (err/unsupported!))
      (include-vertex! [_ v] (err/unsupported!))
      (execute!
        [_]

            (-deref [_] ctx)])
      IGraphExecutor
      (stop! [_] (err/unsupported!))
      (notify! [_] (err/unsupported!))
      (include-vertex! [_ v] (err/unsupported!))
      (execute!
        [_]
